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If it's coming from the weep hole - the pump needs replaced. If it's from the gasket - clean the engine side surface and water pump surface REALLY GOOD - green scotch brite pads, i'll even use very light grit sand paper on some, but you shouldn't do that unless you're very familiar with subaru/aluminum engine work like this. install a Subaru OEM gasket and make sure all the bolt holes and bolts are clean. Buy a Subaru or AISIN water pump

There is one quick voltage check I think you should make. Unplug the ign. coil. Hook your volt meter to a good ground and fuse # 16. Turn the key to on. What is the voltage? Turn the key to start. What is the voltage? Reconnect the ign. coil.

Nice presentation of your adaptation. I went through three or four and gave Up. Mounted my 0-5V gauge instead to monitor knock sensor, only for the sun to buckle it's screen

Thank you for your Kind Words which are really appreciated Yes, my Beloved "BumbleBeast" is still running and offroading occasionally in Honduras. Now features some scratches done by my paranormal Dog while climbs on it... Kind Regards. (as usual on my posts, underlined words are web links)